Domestic cooking vessel



2 Sheets-Sheet 1.

(No Model.)

R, O. ANDERSBN. DOMESTIC 0001mm VESSEL.

Patented Aug. 20, 1895 8 wvewltoz WM (NO Model.) G. 2 Sheets-Sheet 2.

DOMESTIO COOKING VESSEL.

No. 544,717. Patented Aug. 20, 1895.'

NITED STATES PATENT OFFICE.

RIOI-IARD C. ANDERSEN, OF LINCOLN, NEBRASKA.

DOMESTIC COOKlNG VESSEL.

SPECIFICATION forming part of Letters Patent No. 544,717, dated August 20, 1895.

Application filed February 14,1895. Serial No. 538,408. (No model.)

To all whom itmoay concern:

Be it known that I, RICHARD O. ANDERSEN, a resident of Lincoln, in the county of Lancaster and State of Nebraska, have invented certain new and useful Improvementsin Domestic Cooking Vessels; and I do hereby declare the followingto be a full, clear, and exact-description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

, The invention relates to that class of domestic boilers or pots which have a steam-tube extending from just beneath the cover to the bottom of the vessel.

The object of the invention is to increase the efficiency and durability of such devices without adding to their complexity or cost; and it consists in the construction hereinafter described and particularly pointed out.

In the accompanying drawings, Figure 1 is a vertical central section. Fig. 2 is a transverse section. Fig. 3 is a section of a modification. Fig. 4 is an enlarged partial section, and Fig. 5 is a section on line 5 5 of Fig. 4.

Numerals 1 and 2 denote, respectively, the copper bottom and the upper portion of a coffee-pot or other cooking vessel. '3 indicates its cover, which is made to fit the body of the vessel with a substantially steam-tight joint. Preferably both the body and the cover-rim are made frusto-conical, the rim having its diameters in the base and top planes at trifle larger and smaller, respectively, than the upper diameter of the body, whereby the cover is adapted to be jam med on the body with increasing friction and closeness.

4 and 5 denote conduits extending from the top to the bottom of the vessel, as shown.

the outer V-shaped piecebehind beads 15,.

formed in its walls, as indicated in said Fig. 3, and held without solder. The two conduits thus formed are partially closed'at top by a transverse plate 6, secured to the wall of the vessel. 7 denotes an opening in said plate directly over conduit 4, and 8 is an opening beneath plate 6, by which the inner conduit 5 communicates directly with 'the interior of the vessel. At their bottom the tubes or conduits 4and 5 communicate with a chamber 12, formed in the vessels bottom by stamping up a portion 9 thereof and soldering over it a piece 10 situated in or near the plane of said bottom. The wall of conduit 5 extends at 13 to a plane intermediate the upper and lower walls of the reheating-chamber 12, formed by 'the'parts 9 and 10. Said chamber has an exit at 11 on its edge toward the center of the vessels bottom. It is important that the plate 10 be in substantially the same plane as the main part of thevessels bottom, so as not to interfere with its resting flatly upon a stoveplate.

The conduits 4 and 5 and plates 6 and 10 are made from tin-waste, and the upper wall of the chamber 12 is formed from the vessels bottom, insuring great economy of material. The walls. of the conduits 4 and 5 stiffen the vessel adjacent to the handle and also lessen the degree of heating to which it is liable, for the reason that these conduits are filled with air during the heating-up operation.

In using the vessel to infuse cotfee, for example, the cover is tightly closed down upon the vessel. After steam-is formed and a slight pressure thereby generated, it will be forced into the larger open-topped conduit 4, and will be partially condensed therein and descend to the plate 10, which ordinarily will be situated on or just above a stove-top sufficiently hot to immediately superheat the vapor or steam,which will then ascend conduit 5 andpass out at the opening 7 under plate 6 into the vessel, or, failing to ascend under exceptional circumstances, will pass out of the opening 11. In the latter case, if the vessel is suitably situated near'or over a pothole or draft-inlet to the stove or range, the steam will be drawn into the same, especially if the vessel has been mved to a-cool part of vessel begin to boil or approach closely the boiling-point a circulation is produced by the descent of vapor in conduit 4 which is superheated in chamber 12 and ascends conduit and returns again to the Vessel.

I have found by long-continued experiment that the conduits 4: and 5 must have a proper relative size to insure the operation described. Such proportionate sizes are indicated in the drawings, which illustrate a served.

colfee-pot of usual form and medium size, the main figure being drawn to a scale of about two-thirds. An average transverse area of about three-eighths of a square inch for the larger conduit and of one-eighth for the smaller in a pot of the size described will operate efficiently. For vessels of greater or less size and heating capacity the conduits will be enlarged or diminished and about the same relative transverse dimensions pre- This circulation is secured by the cooling effect of the exterior of the vessel adjacent conduit 4, which determines a downward circulation therein and insures entrance of steam at its top, this action being aided by plate 6, which closes direct descent into conduit 5. The entrance of a return current of steam from chamber 12 into conduit 5 is determined by its greater heat.- The downward extension 13 of the wall that separates the two conduits insures that vapor and liquid descending in conduit 4 shall be carried 7 below the mouth of conduit 5, and also that the same vapor when reheated and imbued with greater ascensional force shall pass from the top of chamber 12 into conduit 5.

I do not herein broadly claim conduits for the general purpose and function herein set forth, but the novel construction whereby the operation is made more certain and greater economy, simplicity, and durability secured.

Having thus fully described my invention, what I claim is- 1. In a coffee pot or like vessel two conduits 4 and 5 formed by the piece of V-shape in cross section having a partition plate secured thereto and itself secured to the vessel, the plate 6 having an opening 7 and the conduit 5 an opening 8 beneath the plate, the chamber 12 formed by a raised portion 9 of the bottom, and a covering plate 10 situated in the plane of said bottom, substantially as set forth.

2. In a coffee pot or like vessel two conduits 4 and 5 formed by the piece of V-shape in cross section having a partition plate secured thereto and itself secured to the vessel, the plate 6 having an opening-7 and the conduit 5 an opening 8 beneath the plate, the chamber 12 formed by a raised portion 9 of the bottom, a covering plate 10 situated in the plane of said bottomand the downward extension 13 of the wall separating said conduits, substantially as set forth.

3. In a coffee pot or like vessel the conduit 4 for the descent of vapor, a reheating chamber formed in the bottom of the vessel and a conduit 5 for the ascent of steam both conduits connecting with the re-heating chamber and with the upper part of the vessel, the former having a transverse area about three times that of the latter, substantially as set forth.

4. In a colfeepot or like vessel the conduit 4 for the descent of vapor, a re-heating chamber formed in the bottom of the vessel and a conduit 5 for the ascent of steam both conduits connecting with the re-heating chamber and with the upper part of the vessel,a plate such as 6 to obstruct entrance to the top of flue 5 and a guard such as 13 to direct the descending vapor below the ascending steam, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

RICHARD O. ANDERSEN.

\Vitnesses:

H. H. WELLS, O. A. BANCROFT. 

